Surgical ciliated cyst is one of the rare sinus pathologies that have got multiple etiological factors. It was interesting to note that its major cause is iatrogenic injuries to the sinus lining. With the advent of atraumatic extraction techniques the sinus injuries were rare. This paper reports a case with of surgical ciliated cyst of right maxillary sinus, following surgical removal of endodontically treated fractured upper right first molar.